Perhaps you should try some spelling variations:
"modified geochemical composition algorithm" » "modified chemical compositions algorithm", "modified geochemical decomposition algorithm", "modified geochemical convolution algorithms"
"modified coverage approximation algorithms" » "modified average approximation algorithms"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("modified geochemical composition algorithm") OR ("modified coverage approximation algorithms"))~.
• Removing quotes may allow a broader search: (( modified geochemical composition algorithm ) or ( modified coverage approximation algorithms ))~.
• Adding a wildcard symbol may retrieve word variants: (("modified geochemical composition algorithm") or ("modified coverage approximation algorithms"))*.